cg_llvm: stop identifying ADTs in LLVM IR

Now that we use opaque pointers, ADTs can no longer be recursive, so we
do not need to name them. Previously, this would be necessary if you had
a struct like

```rs
struct Foo(Box<Foo>, u64, u64);
```

which would be represented with something like

```ll
%Foo = type { %Foo*, i64, i64 }
```

which is now just

```ll
{ ptr, i64, i64 }
```

0 files changed, 0 insertions, 0 deletions